Proper advice, but be aware that once you go down that rabbit hole, you will find that every doc you see will try to convince you that his specialty is THE ONE to cure what ails you. Don't jump into anything too quickly, you'll know when the time is right to go further.

Start with stretching, core strengthening. Light weight training and resistance bands. Slowly increase your cycling and route difficulty. Take plenty of rest days, but keep at it. Give it time. Maybe not a formal bike fit, but make sure your fit is appropriate for you.

If all of that shows no progress, then start pursuing medical tx. That is exactly how I handled it. My treatments are probably of no interest to you, so I will not bore you with the details.

Small progress and consistency.