The answer depends on what makes the two trademarks similar in the first place.
If it is a similarity in the name, sometimes adding a distinct graphical element and applying for a logo trademark instead of a wordmark might help.
If it's logo similarity, it might help remove similar elements and/or replace them with others.
If you use our free lawyer's check to retrieve all trademarks similar to yours, we can offer a more personalized answer.
It's worth mentioning that even if two marks seem similar, this might not cause problems if the brands operate in different industries. Sometimes, the applicant will have to gather evidence and present it to the IP office during the opposition proceedings to make a case for the co-existence of the two trademarks.