How to pronounce /r/ sound!?

I am non-native and I find it really difficult to pronounce the /r/ sound, I can pronounce /r/ sound when there is no /l/ in a word such as 'where' and 'wire' or when /r/ sound is at the beginning of a word such as 'rain' and 'ripe' but when it comes to the words such as 'clear' which have both /l/ and /r/ sounds in it, my tongue gets twisted and pronounces /r/ sound as /l/ sound. I am seriously dying to pronounce the following sentence fluently. "My magic will tear you apart." I can pronounce the word 'tear' properly in British accent because it does not need to roll your tongue but I can't in American accent. Because the word 'tear' is right after the word 'will', it makes my tongue pronounce 'tear' as 'tell'. I watched lots of youtube videos but I still can't do it properly. I need your help. Any tips would be appreciated.