Groups should occasionally increase prices. Members react better to less frequent, larger price increases as opposed to many small increases. The emotional stress of paying more is often higher than the financial burden.
To increase prices on Heylo, create a new membership tier with the new price. If the price increase is uniform for all members, move the existing members to the new tier. They will be notified and charged accordingly.
If the price increase is only for new members, move the existing membership tier to hidden and make the new membership tier visible. New members will only be able to see the new membership tier and price when signing up.