First comes acceptance
Though you are an advanced musician, you are learning a new skill and it will take time. Accepting that and having the humility to start at a low base and work your way up will make your piano playing journey easier.
Get a teacher or find groups
Getting a teacher when starting something new is always advisable. They can show you good technique, provide with appropriate materials, give you a reason to practice (the fear of disappointing your teacher never goes away) etc...
If you think you have the discipline and fortitude to be a self-learner on the piano, you should look to joining groups,bands etc.... where you have to learn material for each session or meetup. While a band is the most obvious thing to try and join, you may not be advanced enough for it so adult piano playing meetups might be appropriate:
Time spent practicing
Do you remember a time, especially when you were younger, that at the beginning of learning a new skill or taking up a new activity (like homework), it was suggested you spend a short amount of time daily doing it? A period between 10 minutes and and an hour? I suggest that you revert back to this the way of practicing for a while. As you build momentum you can alter how long you spend practicing but it is more important that you build a consistent habit of practice. Approaching playing the piano like you might with with the violin will likely lead to disappointment and frustration.
Look for little victories
What I always say to people that ask about learning the piano or anything else, is to think hard about what you are trying to achieve each time you sit down. This can be done away from the piano and make your practice sessions much more effective.
This might be case of taking 1 bar of a 32 bar piece and playing it perfectly. Forget about the other 31 bars and just focus on that 1 bar for 5 to 10 minutes. If you can manage to improve in that one bar then you will be elated and encouraged to move forward. Playing slowly may be central to these improvements.
It is almost a given that people will try to move too fast when learning a new skill, before they have acquired the necessary control. It's unlikely that you have ever played to click at 20BPM in 4/4. It's harder than you think and your initial inability to do so will expose your lack of control It's very important to try to master something at very slow tempos where you are completely relaxed and in control:
This is an interesting motif played at 120BPM
And here is the same motif played at 20BPM with a metronome underneath
You may not be able to play the whole motif at 120BPM but you can certainly improve the left hand at 20BPM. If you are to improve on the piano you have to find your specific problem areas and focus on them in this sort of manner. Use deliberate practice and you'll be surprised how fast you can improve.
The other thing about going slow is that it is actually quite difficult to tense up and lose technique at this kind of tempo. This is very much like how difficult (impossibile?) it is to relax at tempos that are beyond your control.
Look for easier pieces in your chosen genre
There may be ambitious pieces that you would like to attempt but for the minute maybe focus on short easier ones. How do you eat an elephant? One bite at a time....
Scott Joplin - The Entertainer sheet music for Piano - 8notes.com