Hard to advise without more detail and being there to watch and hear.
The most important question is: How long has it been since you have been back on the trumpet? It takes weeks (on average 6 weeks) to tone muscle to the point of getting a consistent response. Time playing may be a relevant issue.
Once the basic embouchure development is well underway, than yes, playing with others and listening and then hearing the changes you need to make would be of high value.
Is the trumpet in need of repair? Have you had other experienced trumpet players play your trumpet and if so, is the intonation fine when others play? If so, we can likely exclude instrument contribution out of the discussion.