At least in Sweden the policy regarding booster after the 3rd shot has changed [1]:

> Adults

> For adults aged 18–64, the recommendation for three doses of the vaccinate remains in force. But anyone who wants to receive an additional booster dose, dose 4, may do so in the autumn of 2022. 65 plus and risk groups

> An additional booster dose of the Covid-19 vaccine is recommended for the autumn and winter 2022/23 for adults aged 65 years or over, as well as people aged 18 or over who are in an at-risk group. This recommendation is valid from 1 September 2022 and covers everyone who is at an increased risk of serious Covid -19 disease.

[1] https://www.krisinformation.se/en/hazards-and-risks/disaster...