I too am trying to remember the Russian I learnt grammatically in the 1960s. Wrong approach really; better to have a friend to talk to you exclusively in the target language, then guess the meaning, imitate the pronunciation and make plenty of mistakes. It worked for me with Hausa in West Africa.
I used to know all the declensions and conjugations of Latin, but so what??
Having said that, I LOVE grammar, so let's study together. What grammar book do you use?