this is why - if you can afford it - you should stock up a bit on Forever stamps, before the next price increase ! 
You can also go to this thead where postcrossers discuss using old stamps on their postcards in conjunction with other new or old stamps. In some cases you can save money by buying āunder face valueā for unused old stamps! and you can still use them for the amount listed on the stamp. You might need to do a bit of math if you use non-international specific stamps.
I was so lucky. I didnāt know of the price increase but noticed that the Chinese New year stamps were a little pricier compared with other Forever so I research and I was able to buy some 66c stamps that are now worthy 68c.
The only thing that didnāt work is that I like to make up International with 2 forever and then add small postage (people like more than 1 stamp in their cards and International design is so boring and almost never changes), before that math was 66+66+10+5+3 for 1.50 now it would be 68+68+10+5+4 for 1.55 so I have an excess of 3c lamps stamps and would have to by some 1c, or use 68+68+10+10 or 68+68+10+5+5 and lose 1c, lol
Iāve been using two forever and a vintage 13 cent & 6 cent stamps.
If you have an excess of now-unnecessary 3c stamps, you can also use a combination of 2Ć 68c + 10c + 3Ć 3c, until youāve exhausted your supply.
Great, it will be boring (3 of the same) but it worksā¦ Thanks for the suggestion
My new go to combination now is:
2 ounce + 1 Postcard Stamp + 10 Ā¢ pears
92+53+10 = 1.55
itās a bit boring but super simple as itās just 3 stamps and i donāt have to glue any vintage stamps which is what i had to do before.