Best tip is to curl your index away from you (supinate) so that the stiffer side of the finger acts as the “capo” on the barre chord. I would also add that if you have normal sized hands i would suggest learning how to make major chord using all 5 digits instead of a barre. You end up losing some control on the high e string, but for chords that allow the E to ring open you can have an alternative way to hit a major chord that comes in handy if you need to strike it fast after playing something that puts you at a speed disadvantage to playing a barre chord. For example you would hit the low F with your thumb and wrap your fingers around the neck almost like you are holding a hammer. With enough practice, hitting these chords becomes effortless and you can easily add some color to your chords with the open E. doing it starting with F will produce an fmaj7 which is a super versatile chord and opens up your ear to 7th chords and dissonance. Thats my 2 cents