I'm the same on hormone therapy - probably only orgasm about half the time (if that), whereas I always did before.
You do need to look on things differently. If you regard sex as a means to an orgasm, then you are going to be disappointed some of the time. However, sex needs to be enjoyable, so it needs to be about something achievable, so it needs to be looked upon differently. Orgasm is not the only pleasant part of sex - the lead up is good too, and the experience you are giving your partner. You should focus on these, but if an orgasm happens, that's a bonus on top.
You might also look at some powerful male vibrators which might be helpful for reaching orgasm, although I can't guarantee they'll work for you. The Guybrator is one that gets mentioned in gay/bi support groups (which tend to be much more open discussing this sort of thing). It's also good for men who can't get an erection but want to orgasm. Vibrators don't work for all men though, and can just generate soreness.