I’ll give u a nice tip, and that is to try and join a cross-realm community and try to get into some keys there. That way u dont have to keep getting declined all the time, and u can build up your rio score, experience and make some friendships aswell 
Have a look in the communities recruitment section, but i’ll leave a link to a community that i have been a part of since i returned in bfa and was clueless about m+, rio and all that jazz: (Alliance) Scared of Dungeons EU EN - #171 by Sinaaki-argent-dawn
Open the community tab in game (J), press join community and add the code and voila!