Split of Shares in TFSA & Margin (Cash) Account

Hi Guys,

In past I have bought same company share (Example: RY) partially in TFSA and balance in Margin (CAD cash) account.
And this was purely done due to lack of TFSA limit and I still wanted to buy more of the same shares.
Does this limit anything or has any consequences in future when I decide to trade these shares?

What would be your suggestion if my TFSA & RRSP limits are over and I still would like to add more funds/shares, what is the right way to go about it?

Once I have used my TFSA/RRSP limits and when I get dividend in these accounts and those accumulated dividend funds either sit under the same account or I use those funds in buying shares within TFSA/RRSP account, does this attract any tax liability or I don’t pay tax till I withdraw from RRSP account any funds?