Portfolio rebalancing

Do you guys sell your underperforming stocks and actualise the loss when rebalancing your portfolio? I still have about 30% of my portfolio in equities which were purchased when I first started, some of which have been in the red for a long time (SingTel 👀).

How do you guys approach your underperfoming equities/ETFs when rebalancing? Do y’all actualise the loss? Or just wait it out and rebalance by purchasing more of other equities/ETFs?