Welcome to the forum!
You have not indicated what valve type, but because your doctors have told you no contact sports I will assume that you have a mechanical valve and are now on warfarin.
I am in the same situation, having had my aortic valve replaced with a mechanical valve 6 weeks ago. I really struggled with the decision at first whether to go tissue or mechanical, because I am very involved in heavy contact sports- boxing, kick boxing, MMA and competitive Brazilian Jiu Jitsu. Ultimately, I chose mechanical because of the longer life expectancy for my age- 53, even though this would mean giving up the sports I loved the most.
What helped me with my decision was reading dozens of posts from others on this forum who live physically active lives on warfarin. I realized I can still live an active life, but just need to make some changes and be sensible. Boxing, kick boxing and MMA are out, because even with head gear on, I can't risk taking punches or kicks to the head as it could lead to a life threatening bleed. Competition BJJ is out, but I can still train technique and also plan to focus more on teaching, which I also love very much.
Also, I plan to revisit some of the active sports and hobbies that I did in years past but have not been active in lately with my focus being on martial arts in recent years. I plan to get back into scuba diving and free diving. I will probably pick up racquetball again. I may do some biking once again, although in a sensible way- no more high speed downhill mountain biking. I will probably get back into lifting weights. I may compete at some endurance sports- I was once into marathons and ultra marathons, but it has been over 11 years. Now that my valve has about 2x the valve opening as my native valve, I am kind of excited to discover whether this will lead to competitive times in endurance sports. I have always loved hiking, especially challenging steep hikes and I plan to double down on this going forward.
Honestly, giving up the kick boxing and boxing has not been easy. I made the MMA team at Dan Henderson's Team Quest at age 49, by far the oldest fighter on the team and experienced great joy competing with the young bucks. It made me feel ageless. But, the reality is that I am not ageless and as much as I loved these sports it is probably a good time to give them up, given my age, warfarin or not. Taking too many hits to the head is not a good idea, especially once we reach a certain age.
There are so many things which I can do and I am looking forward to getting back into the previous activities mentioned and also exploring new ones. It is a process of letting go of some things, but being excited about learning new things and making the most of the things which I can still do. It comes down to making sensible choices, choosing sports which are not likely to lead to a major bleed, especially avoiding sports which might lead to head injuries.