Tennis elbow started for me maybe 15 yrs ago. The fix then was a brace like this
https://www.walmart.com/ip/MUELLER-T...&wl13=&veh=sem
And cortizone shots. Did the right and the left years apart. Than about 2 yrs the left started hurting again. Went to a different Doc since we had moved and he said current thinking is no shots and gave me some exercises to do. I was dubious, but 6 weeks of the exercises and pain is gone and hasn't come back.