Healing Spells are at least first level, so you cannot use those
You cannot use healing word because it is not a cantrip. The paladins aura of healing heals as a bonus action - no casting in the same turn necessary, but unfortunately, it requires concentration which you need for beacon of hope. There are no healing Cantrips.
Potion house rule
I heard, some people allow drinking a potion of healing as a bonus action through a house rule. You should ask your GM about this.
Take one level of fighter
If you are allowed to multiclass, you can take a level of fighter which will give you access to second wind.
Hand of Vecna
The artifact hand of Vecna heals you by 1d10 hit points per turn without using spells or consuming an action.